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Program ID 6900: GHRS Cycle 6: Echelle and G140M Long-term Monitor

Purpose: The purpose of this program is to monitor the long-term stability (time-scale: 1 year) of the sensitivity of ECH-A, ECH-B, and G140M.

Description: This proposal defines a series of observations that will continue the long-term monitor of ECH-A, G140M, and ECH-B. ECH-A and G140M observations will be made both through the LSA and the SSA. ECH-B observations are through the LSA only. Mu Col is used for all observations. For the echelles, OSCAN observations will measure the sensitivity near the blaze peak. The setups for ECH-B are chosen to be the same as those used in SV, to maintain traceability to the original calibrations. WSCAN observations will scan across order 20 in ECH-B. ECH-A is used with an OSCAN at the blaze peak (mlambda =56100), plus 1 WSCAN. G140M is used at 1100, 1200, 1300, 1400, 1500, and 1600 Å.

Fraction of GO Programs Supported: All GHRS programs using ECH-A (11%), ECH-B (11%), and G140M (10%) in Cycles 4, 5, and 6.

Resources:

Observation: External-6 orbits (3 orbits for ECH-A + G140M, and 3 orbits for ECH-B).

Analysis: 0.03 FTE. The data will be reduced and analyzed by a A. Gonnella (0.02 FTE) and C. Leitherer (0.01 FTE). The reduction and analysis will be completed within 2 weeks of test execution, assuming 50% effort of the DA and 20% of the IS during that time.

Special Requirements: This test should be executed in the middle of Cycle 6 (+/- 2 months).

Accuracy: The goal of this program is to monitor and document the long-term behavior of the echelle and G140M sensitivities. The sensitivities found in this program will be compared to previous measurement obtained for the same star and with the same instrument configuration.The relative accuracy will be at least 2%.

Products: The results of the test will be documented in an ISR within 2 months after completion of the program.